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John Green returns to 'Crash Course' for lecture about his (least) favorite diseaseThe disease has left its mark all through human history ... and scientific perspective." "Crash Course," is a show created by Green and his brother Hank, who founded the production company ...
Hank Green and his brother John started the YouTube ... initiated other popular projects like the educational channels Crash Course and SciShow, and the online video conference VidCon.
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